<template>
  <div class="app-container">
    课程列表

    <!--查询表单-->
    <el-form :inline="true" class="demo-form-inline">
      <el-form-item>
        <el-input v-model="courseQuery.title" placeholder="课程名称" />
      </el-form-item>

      <el-form-item>
        <el-select v-model="courseQuery.status" clearable placeholder="课程状态">
          <el-option value="Normal" label="已发布" />
          <el-option value="Draft" label="未发布" />
        </el-select>
      </el-form-item>

      <el-button type="primary" icon="el-icon-search" @click="getList()">查询</el-button>
      <el-button type="default" @click="resetData()">清空</el-button>
    </el-form>

    <!-- 表格 -->
    <el-table v-loading="listLoading" :data="list" border fit highlight-current-row>
      <el-table-column label="序号" width="70" align="center">
        <template slot-scope="scope">
          {{ (page - 1) * limit + scope.$index + 1 }}
        </template>
      </el-table-column>

      <el-table-column prop="title" label="课程名称" />

      <el-table-column label="课程状态" width="80">
        <template slot-scope="scope">
          <el-tag :type="scope.row.status === 'Normal'?'success':'danger'" effect="dark">
            {{ scope.row.status === "Normal" ? "已发布" : "未发布" }}
          </el-tag>
        </template>
      </el-table-column>

      <el-table-column prop="lessonNum" label="课时数" width="80" />

      <el-table-column prop="gmtCreate" label="添加时间" width="160" />

      <el-table-column prop="viewCount" label="浏览数量" width="60" />

      <el-table-column label="操作" width="500" align="center">
        <template slot-scope="scope">
          <router-link :to="'/edu/course/info/' + scope.row.id">
            <el-button type="primary" size="mini" icon="el-icon-edit"
              >编辑课程信息</el-button
            >
          </router-link>
          <!-- <router-link :to="'/edu/course/chapter/' + scope.row.id">
            <el-button type="primary" size="mini" icon="el-icon-edit"
              >编辑课程大纲</el-button
            >
          </router-link> -->
          <el-button
            v-if="scope.row.status == 'Normal'"
            type="warning"
            size="mini"
            icon="el-icon-edit"
            @click="revokeCourse(scope.row.id)"
            >撤销课程</el-button
          >
          <el-button
            v-else
            type="warning"
            size="mini"
            icon="el-icon-edit"
            @click="publish(scope.row.id)"
            >发布课程</el-button
          >

          <el-button
            type="danger"
            size="mini"
            icon="el-icon-delete"
            @click="removeDataById(scope.row.id)"
            >删除课程信息</el-button
          >
        </template>
      </el-table-column>
    </el-table>

    <!-- 分页 -->
    <el-pagination
      :current-page="page"
      :page-size="limit"
      :total="total"
      style="padding: 30px 0; text-align: center"
      layout="total, prev, pager, next, jumper"
      @current-change="getList"
      @size-change="changeSize"
    />
  </div>
</template>
<script>
//引入调用teacher.js文件
import course from "@/api/edu/course";

export default {
  //写核心代码位置
  // data:{
  // },
  data() {
    //定义变量和初始值
    return {
      listLoading: true, // 数据是否正在加载
      list: null, //查询之后接口返回集合
      page: 1, //当前页
      limit: 10, //每页记录数
      total: 0, //总记录数
      courseQuery: {}, //条件封装对象
    };
  },
  created() {
    //页面渲染之前执行，一般调用methods定义的方法
    //调用
    this.getList();
  },
  methods: {
    // 当页码发生改变的时候
    changeSize(size) {
      console.log(size);
      this.limit = size;
      this.getList(1);
    },
    //创建具体的方法，调用teacher.js定义的方法
    //讲师列表的方法
    getList(page = 1) {
      console.log("翻页。。。" + page);
      // 异步获取远程数据（ajax）
      this.page = page;

      course.getListCourse(this.page, this.limit).then((response) => {
        //请求成功
        //response接口返回的数据
        this.list = response.data.records;
        this.total = response.data.total;

        // 数据加载并绑定成功
        this.listLoading = false;
      });
    },

    resetData() {
      //清空的方法
      //表单输入项数据清空
      this.courseQuery = {};
      //查询所有讲师数据
      this.getList();
    },

    publish(courseId) {
      course.publihCourse(courseId).then((response) => {
        //提示
        this.$message({
          type: "success",
          message: "课程发布成功!",
        });
        this.getList();
      });
    },

    revokeCourse(courseId) {
      course.revokeCourse(courseId).then((response) => {
        //提示
        this.$message({
          type: "success",
          message: "课程撤销成功!",
        });
        this.getList();
      });
    },

    //删除方法
    removeDataById(courseId) {
      this.$confirm("此操作将永久删除该记录, 是否继续?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(() => {
          // promise
          // 点击确定，远程调用ajax
          return course.deleteCourse(courseId);
        })
        .then((response) => {
          if (response.success) {
            this.$message({
              type: "success",
              message: "课程删除成功!",
            });
            this.getList();
          }
        })
        .catch(() => {
          this.$message({
            type: "info",
            message: "已取消删除",
          });
        });
    },
  },
};
</script>
